INCOMMENSURATE STATE OF CSCUCL3 IN A TRANSVERSE MAGNETIC-FIELD

A model of CsCuCl3 in a magnetic field parallel to the a-b planes is s tudied in the mean-field approximation. Over the bulk of the temperatu re-field phase diagram below the ordering temperature T-c, the phase s equence at constant temperature is incommensurate-->commensurate-->par amagnetic with increasing field, and the incommensurate state has wind ing character. The amplitude of the order parameter softens at higher temperatures, and within about 0.5 K of T-c the incommensurate state h as winding character at low fields but nonwinding character at high. A direct incommensurate-->paramagnetic transition occurs at higher temp eratures, with no intervening commensurate state.